CN113252125B - Wet-type gas flowmeter with high measurement accuracy and metering drum rotation mechanism - Google Patents
Wet-type gas flowmeter with high measurement accuracy and metering drum rotation mechanism Download PDFInfo
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- CN113252125B CN113252125B CN202110570232.0A CN202110570232A CN113252125B CN 113252125 B CN113252125 B CN 113252125B CN 202110570232 A CN202110570232 A CN 202110570232A CN 113252125 B CN113252125 B CN 113252125B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a wet gas flowmeter with high measurement accuracy, a metering drum rotating mechanism and a metering indicating mechanism. The shell sealing and supporting assembly consists of a sealing shell, an air inlet interface, an air outlet pipe, an air outlet interface and a supporting seat, the metering drum rotating mechanism consists of a metering drum, a sleeve, an inner magnetic disk, a shaft, a ball bearing and a universal ball head, and the metering indication indicating mechanism consists of a pointer, a mandrel, a bearing seat, a mounting bracket and an outer magnetic disk. The invention is realized by pushing the measuring drum arranged in the shell to rotate by the measured gas and transmitting the measuring value to the measuring indication mechanism outside the shell by magnetic coupling; meanwhile, the manufacturability of the whole structure is improved, and the interchangeability of all large parts of the flowmeter is realized. The invention improves the rotation stability of the metering drum and reduces the influence of liquid level fluctuation on the metering precision.
Description
Technical Field
The invention relates to a measuring instrument for measuring gas volume, in particular to a wet gas flowmeter with high measurement accuracy, a measuring drum rotating mechanism and a measuring indicating mechanism.
Technical Field
The wet gas flowmeter is a volumetric gas flowmeter which completely isolates the gas inlet end and the gas outlet end of the metering drum by means of sealing liquid, and has the characteristics of no leakage and stable metering. High accuracy wet gas flow meters require 0.5%, 0.2% measurement spread uncertainty, often used as etalons.
The wet gas flowmeter mainly comprises a rotatable drum wheel with an inner part divided into 3-5 metering air chambers by spiral blades, wherein the drum wheel is supported in sealing liquid with a certain liquid level height and rotates under the action of pressure difference of gas entering and exiting, the metering air chamber is inflated from the liquid level, the gas enters the liquid level and is discharged, the exhaust is metered, and finally, the exhaust metering value is obtained through mechanical or electronic recording rotation; the air inlet end and the air outlet end of the metering drum are completely isolated through sealing liquid, so that the metering drum has the characteristics of no leakage and stable metering, has measurement expansion uncertainty of 0.5% and 0.2%, and is often used as a standard device.
Because the structural design of the wet gas flowmeter in the industry is unreasonable, when the gas flow tested by the wet gas flowmeter is increased, the pressure difference between the inside and the outside of the measuring chamber is increased, the liquid level difference of the sealing liquid is increased, the volume of the measuring chamber is increased, the indication error is obviously deviated, and the indication error in the actual testing process is generally within a larger range of +/-1% - +/-1.5%.
In addition, when the same flow is continuously measured for a plurality of times under the same environment and working condition, the error obtained by measurement is random error, and the random error is mainly influenced by the stability of the rotation process of the metering drum, so that the rotation stability of the supporting bearing of the metering drum must be well ensured in the measurement process in order to improve the measurement repeatability. However, due to the requirement of portability of the flowmeter, the manufacturing of the shell welding assembly component adopts a thin-wall metal material welding forming process, and in the welding process, the accuracy of the mounting hole of the support bearing for supporting the core shaft of the metering drum is difficult to ensure, so that the stability of the rotation process of the metering drum is influenced.
In the existing wet gas flowmeter, an oil seal is adopted between a shaft supporting a metering drum and a mounting hole supporting a bearing for sealing treatment, however, the oil seal belongs to a vulnerable part, and is easy to wear and fail, so that hidden danger of leakage of sealing liquid exists; meanwhile, when the oil seal is worn out and fails, the friction force is increased, which affects the rotation stability of the metering drum and leads to poor metering accuracy.
In summary, the accuracy of the existing wet gas flow meter is easily affected in the actual use process, so that there is an urgent need for a high-accuracy wet gas flow meter with good repeatability.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a technical scheme of a high-measurement-accuracy wet gas flowmeter, a metering drum slewing mechanism and a metering indicating mechanism, so as to improve measurement indication errors, good repeatability, reliable sealing performance and good structural manufacturability of the wet gas flowmeter.
The technical scheme adopted by the technology of the patent is mainly as follows:
a high-measurement-accuracy wet gas flowmeter adopts a modularized structural layout, and consists of a metering indication indicating mechanism, a shell sealing support assembly and a metering drum slewing mechanism. The shell sealing and supporting assembly consists of a sealing shell, an air inlet interface, an air outlet pipe, an air outlet interface and a supporting seat, the metering drum rotating mechanism consists of a metering drum, a sleeve, an inner magnetic disk, a shaft, a ball bearing and a universal ball head, and the metering indication indicating mechanism consists of a pointer, a mandrel, a bearing seat, a mounting bracket and an outer magnetic disk. Two supporting seats are symmetrically arranged at two ends of a sealing chamber in the shell sealing supporting assembly respectively, and the metering drum slewing mechanism is connected in the shell sealing supporting assembly through universal ball bearings arranged at two ends of a shaft in a supporting mode. The metering indication indicating mechanism is installed and connected outside the shell sealing and supporting assembly through the installing support. The metering indication indicating mechanism and the metering drum rotating mechanism are mutually and magnetically coupled and connected through two corresponding non-contact magnetic disks positioned inside and outside the sealing shell.
The wet gas flowmeter with high measurement accuracy is characterized in that: the back exhaust structure layout mode is adopted, and the back exhaust structure layout mode consists of a flowmeter sealing shell, a metering drum, an output air pipe, an air inlet interface and an air outlet interface which are welded on the flowmeter shell. The metering drum is arranged in a sealing cavity of the shell welding assembly through a bearing and becomes a freely rotatable component. The sealing liquid level surface in the cavity divides the inner cavity and the outer cavity of the metering drum into a front bin chamber, a metering chamber and a gas collecting chamber which are directly related to gas metering, so that a gas transmission channel for gas medium to enter from the front end of the metering drum and to be discharged from the rear end is formed.
The wet gas flowmeter with high measurement accuracy is characterized in that: the rotary mechanism of the metering drum is adopted and consists of the metering drum, a sleeve, an inner magnetic disk, a shaft, a ball bearing and a universal ball head. The rotary center of the metering drum is welded with the sleeve into a whole through the connecting plate, an inner magnetic disk is arranged at the front end of the sleeve, two ball bearings are arranged at the two ends of the inner side, and a rotatable shaft is arranged at the center of each ball bearing. The metering drum and the shaft are mutually connected and supported through the ball bearings to form a rotary mechanism, two universal ball heads are mounted at two ends of the shaft of the rotary mechanism, the universal ball heads are mounted in a supporting seat on the central axis of the inner wall of the shell sealing and supporting assembly, and a universal supporting structure capable of completely eliminating the position error of the supporting seat is formed through the inner and outer double-layer composite bearing rotary structure mode.
The wet gas flowmeter with high measurement accuracy is characterized in that: a metering indication mechanism is adopted. Consists of a pointer, a mandrel, a bearing seat, a supporting plate and an outer magnetic disk. The shell of the shell sealing support assembly is fixedly connected with a support plate, a bearing seat with a double-row structure is arranged at the center position of the support plate, a pair of bearings are arranged on an inner hole of the bearing seat, 1 mandrel is arranged and supported on the bearing center hole, a magnetic disk is arranged at the rear end part of the mandrel, and a pointer is arranged at the front end part of the mandrel. The outer magnetic disk is magnetically coupled with the end surface of the inner magnetic disk arranged on the metering drum in the shell sealing bin body, so that synchronous outer transmission of the rotation metering value of the metering drum is realized. The spindle is also provided with a rotation angle amount acquisition unit which acquires the rotation angle amount by two ways, one is that a gear is arranged on the spindle, the rotation angle amount of the spindle is transmitted to a mechanical counter positioned on a supporting plate and displayed with a numerical value, and the other is that a grating encoder is arranged on the spindle, and the rotation angle amount of the spindle is converted into a digital signal to be output.
The invention has the remarkable effects that:
the modular structure design is characterized in that all functional components of the wet gas flowmeter are respectively integrated into three modular structures of a metering indication indicating mechanism, a shell welding assembly component and a metering drum slewing mechanism, all the modular components are simply connected through bolts, and the connection between the components is reliable and high in interchangeability. Therefore, quick state switching among serial products is realized, the assembly production efficiency of the flowmeter is improved, the processing period of parts is shortened, and meanwhile, the daily maintenance of the flowmeter is convenient.
The rear exhaust structure layout mode is characterized in that the air inlet end of the metering drum for determining the magnitude of the indication error is arranged in the front bin at the outer side of the metering drum with relatively large sealing liquid level area, and a narrow space at the rear side inside the metering drum is used as the air collecting chamber at the air outlet end, so that the magnitude of the sealing liquid level in the metering chamber along with the change of the air inlet and outlet pressure difference is obviously small, and the increase of the indication error caused by the space change of the metering chamber due to the change of the air inlet and outlet pressure difference under different flow working conditions is reduced. Tests prove that the error of the full flow range indication value of the flowmeter can be stably controlled within +/-0.5%.
The metering drum slewing mechanism adopts an inner-outer double-layer composite bearing supporting structure mode, the shaft is completely separated from the metering drum, the shaft does not rotate any more and only bears the supporting function, and the shaft is arranged on the outer universal ball head. The problem of the casing because the welding deformation leads to the influence of two supporting seat axiality errors of the front and back symmetric distribution on the casing to bearing and metering drum operational stability is solved, the measurement repeatability precision of flowmeter has been improved by a wide margin, the manufacturing degree of difficulty of the relevant spare part of flowmeter especially casing welded assembly has still been reduced simultaneously, the whole structure manufacturability has been improved.
The metering indicating mechanism transmits the metering value so that the rotation metering characteristic of the metering drum wheel in the sealing bin of the flowmeter can be transmitted to a counter and a dial outside the flowmeter in a non-contact mode of axial end face magnetic coupling. The structure solves the problem that the accuracy of the traditional flowmeter is reduced after the rotation energy loss caused by the friction force of the contact part of the oil seal lip. In addition, the inner magnetic disk and the outer magnetic disk are flexibly connected in a way that the two end faces are axially attracted to each other, and compared with other radial magnetic attraction connection modes, the structure is simpler and more reliable. Therefore, the full sealing of the flowmeter without hidden leakage trouble is realized, and the characteristics of the wet gas flowmeter such as tightness, pressure resistance, durability and the like can be well ensured.
Drawings
FIG. 1 is a schematic diagram of a wet gas flowmeter with high measurement accuracy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a rear exhaust mode structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a drum slewing mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a metering indication mechanism according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the cyclic operation principle of the metering drum according to the embodiment of the invention;
in the accompanying drawings:
the device comprises a metering indication indicating mechanism 1, a shell sealing support assembly 2, a metering drum rotating mechanism 3, a 4 air inlet interface, a 5 front bin, a 6 sealing shell, a 7 metering chamber, an 8 metering drum, a 9 air collecting chamber, a 10 output air pipe, an 11 sealing liquid level surface, a 12 air outlet interface, a 13 sleeve, a 14 inner magnetic disc, a 15 shaft, a 16 ball bearing, a 17 universal ball head, a 18 support seat, a 19 pointer, a 20 mandrel, a 21 bearing, a 22 bearing seat, a 23 support plate, a 24 outer magnetic disc, a 25 angle amount acquisition unit, a 26 front side blade and a 27 rear side blade.
Detailed description of the preferred embodiments
This patent is described in further detail below in conjunction with the embodiments of the drawings.
The invention relates to a high measurement accuracy wet gas flowmeter modularized structure, which is shown in fig. 1: the automatic measuring and displaying device consists of three modularized components, namely a measuring indication indicating mechanism (1), a shell sealing and supporting component (2) and a measuring drum rotating mechanism (3). The shell sealing and supporting assembly (2) is used for supporting the metering indication indicating mechanism (1) and the metering drum revolving mechanism (3) to rotate in the shell sealing and supporting assembly; and a certain amount of sealing liquid is poured into the shell sealing support assembly (2), and a sealing liquid level surface and an internal mechanical part form a plurality of sealing cavities for storing gas. The metering drum rotating mechanism (3) is used as a gas medium volume metering functional component and is installed and connected in the sealing cavity of the shell sealing and supporting component (2) through a universal bearing. The metering indication mechanism (1) is a metering output display functional component and is arranged and fixed outside a sealing cavity of the shell sealing and supporting component (2). The three large modularized components under the structure are connected and combined by bolts, so that quick state switching and maintenance replacement among serial products can be realized by using a simple tool, and batch standardized production of the modularized components can be realized.
The structural layout of the rear exhaust mode of the wet gas flowmeter with high measurement accuracy is shown in fig. 2: the rear exhaust structure layout mode is adopted, the mechanism layout is formed by combining two module components of a shell sealing support assembly (2) and a metering drum rotating mechanism (3) in fig. 1, and the rear exhaust structure is divided into an air inlet interface (4), a front bin (5), a sealing shell (6), a metering chamber (7), a metering drum (8), a gas collection chamber (9), an output air pipe (10), a sealing liquid level surface (11) and an air outlet interface (12) according to the principle. The metering drum (8) is supported in the housing seal support assembly (2) by a bearing and is a freely rotatable component. The sealing liquid level surface (11) in the cavity divides the inner cavity and the outer cavity of the metering drum (8) into a front bin (5), a metering chamber (7) and a gas collecting chamber (9) which are directly related to gas metering and are mutually and alternately circulated in the rotating process. The structure layout flow meter works in a gas flowing state that the air inlet pressure is higher than the air outlet pressure, gas enters the front bin (5) from the air inlet interface (4) under the action of pressure, a pressure difference is formed between the inside and the outside of the side blades of the metering chamber (7) of the metering drum (8), the metering drum (8) is pushed to rotate under the action of pressure, then the gas enters the metering chamber (7) in the process that the bin inside the metering drum (8) alternately circulates, the gas is gradually filled in the metering chamber (7), then is discharged to the air collecting chamber (9), and finally is discharged out of the flow meter through the air outlet pipe (10) and the air outlet interface (12) at the rear end of the flow meter.
Of the above processes, the most important are the metering of the gas and the cyclic operation of the metering chamber (7) within the metering drum (8). As shown in fig. 5: the method comprises three processes of air intake, switching and air exhaust.
And (3) an air inlet process: the measured gas enters the flowmeter through the air inlet interface (4) under the action of pressure, the pressure difference is generated on the side blades of the metering drum (8) to force the metering drum (8) to integrally rotate to the position of the air inlet process shown in the figure 5, the front side blades (26) of the metering drum (8) are in an open state, the rear side blades (27) of the metering drum are in a closed state, the front bin (5) and the metering chamber (7) are in a communicating state, and the measured gas enters the metering chamber (7) and gradually fills the metering chamber (7) along with the rotation of the metering drum.
The switching process comprises the following steps: the metering drum side blade continuously rotates to the switching process position shown in the figure 5 under the action of the gas pressure difference, the metering drum front side blade (26) and the metering drum rear side blade (27) are simultaneously in a closed state, the metering chamber (7) is completely filled with gas at the moment, the volume of the gas in the metering chamber (7) which is instantaneously sealed by the sealed liquid level surface (11) is metered once, and the liquid level height at the moment determines the volume of the metered gas in the metering chamber (7).
And (3) exhausting: the metering drum side blades continuously rotate to the position of the exhaust process shown in the figure 5 under the action of the gas pressure difference, the front side blades (26) of the metering drum (8) are always in a closed state, the rear side blades (27) of the metering drum (8) are slowly opened along with the rotation of the metering drum (8), the metering chamber (7) and the gas collecting chamber (9) are communicated, and the metering drum continuously rotates to completely exhaust the measured gas from the output gas pipe (10).
According to the structure layout of the rear exhaust mode shown in fig. 2, the air inlet end of the metering drum (8) for determining the magnitude of the indication error is arranged in the front bin (5) outside the metering drum (8) with relatively large sealing liquid level area, and the air collection chamber (9) with relatively small rear side inside the metering drum (8) is used as the air outlet end, so that the sealing liquid level of the air inlet end is relatively less in change before and after being pressed, and the indication error of the flowmeter in the full flow range is reduced.
The invention relates to a metering drum slewing mechanism of a wet gas flowmeter with high measurement accuracy, which is shown in fig. 3: the device consists of a metering drum (8), a sleeve (13), an inner magnetic disk (14), a shaft (15), a ball bearing (16) and a universal ball head (17). Wherein the rotation center of the metering drum (8) is welded with the sleeve (13) into a whole through the connecting plate, an inner magnetic disk (14) is arranged at the front end of the sleeve (13), two ball bearings (16) are arranged at the two ends of the inner side, and a rotatable shaft (15) is arranged at the center of each ball bearing (16). The metering drum (8) and the shaft (15) are mutually connected and supported through the ball bearing (16) to form a rotary mechanism, two universal ball heads (17) are arranged at two ends of the rotary mechanism shaft (15), the universal ball heads (17) are arranged in a supporting seat (18) on the central axis of the inner wall of the shell sealing and supporting assembly (2), and a universal supporting structure capable of completely eliminating the position error of the supporting seat (18) is formed through the inner-outer double-layer composite bearing rotary structure mode. The running stability of the structural support rotary part is only influenced by the dimensional precision of the sleeve (13) and the shaft (15), and the two parts can be well ensured through precise machining, so that the influence of the welding deformation of the flowmeter shell on the metering precision is completely avoided, the manufacturing difficulty of the processing of the flowmeter shell is greatly reduced, and the manufacturability of the whole structure is improved.
The invention relates to a metering indication indicating mechanism of a wet gas flowmeter with high measurement accuracy, which is shown in fig. 3: consists of a pointer (19), a mandrel (20), a bearing (21), a bearing seat (22), a supporting plate (23) and an outer magnetic disk (24). The shell of the shell sealing support assembly (2) is fixedly connected with a support plate (23), a bearing seat (22) with a double-row structure is arranged at the center position of the support plate (23), a pair of bearings (21) are arranged at two ends of an inner hole of the bearing seat (22), 1 mandrel (20) is arranged and supported on the center hole of the bearing (21), an outer magnetic disk (24) is arranged at the rear end part of the mandrel (20), and a pointer (19) is arranged at the front end part of the shaft. The outer magnetic disk (24) is magnetically coupled with the end surface of the inner magnetic disk (14) arranged on the metering drum (8) in the shell sealing bin body, so that real-time outer transmission of the rotation metering value of the metering drum (8) is realized. The mandrel (20) is also provided with a rotation angle amount acquisition unit (25) which acquires the rotation angle amount by two ways, one is that a gear is arranged on the mandrel (20) to transmit the rotation angle amount of the mandrel (20) to a mechanical counter positioned on a supporting plate (23) and display the value, and the other is that a grating encoder is arranged on the mandrel (20) to convert the rotation angle amount of the mandrel (20) into a digital signal to be output.
Claims (8)
1. A high measurement accuracy wet gas flow meter, characterized by: the automatic measuring device comprises a measuring indication value indicating mechanism (1), a shell sealing supporting component (2) and a measuring drum rotating mechanism (3), wherein the shell sealing supporting component (2) comprises a sealing shell (6) and a front bin (5) positioned in the sealing shell (6), sealing liquid is filled in the front bin (5), two supporting seats (18) are symmetrically arranged on the inner wall of the front bin (5) respectively, universal ball heads (17) are arranged at two ends of the measuring drum rotating mechanism (3), the measuring drum rotating mechanism (3) is supported in the front bin (5) through the universal ball heads (17), a supporting plate (23) is further arranged on the sealing shell (6), the measuring indication value indicating mechanism (1) is connected to the outside of the front bin (5) through the supporting plate (23), an outer magnetic disc (24) is arranged on the measuring indication value indicating mechanism (1), an inner magnetic disc (14) is arranged on the measuring drum rotating mechanism (3), and the inner magnetic disc (14) and the outer magnetic disc (24) are mutually and magnetically coupled. The rear end of the shell sealing and supporting assembly (2) is provided with an air outlet interface (12), and an air outlet pipe (10) is arranged at the air outlet interface (12); the metering drum slewing mechanism (3) comprises a sleeve (13), a shaft (15) and a metering drum (8), wherein the sleeve (13) is arranged at the rotation center of the metering drum (8) and sleeved on the shaft (15), ball bearings (16) which are respectively rotatably supported at two ends of the sleeve (13) are arranged on the shaft, the metering drum (8) is internally provided with a gas collection chamber (9), and an output gas pipe (10) extends into the gas collection chamber (9).
2. The high measurement accuracy wet gas flow meter according to claim 1, characterized in that the top of the housing seal support assembly (2) is provided with an inlet air interface (4), a pressure measurement device interface and a temperature measurement device interface in communication with a front plenum (5).
3. The wet gas flowmeter of claim 1, wherein the top of the housing seal support assembly (2) is provided with a level gauge, and the bottom of the housing seal support assembly (2) is provided with a screw capable of adjusting the level.
4. The wet gas flowmeter of claim 1, wherein the inner disk (14) and the outer disk (24) are each of a disk-shaped structure with a mounting hole in the center, and a plurality of magnets are uniformly embedded on the disk surface of the disk-shaped structure.
5. The utility model provides a metering drum rotation mechanism, a serial communication port, including metering drum (8), sleeve (13), interior magnetic disk (14), axle (15), ball bearing (16), universal bulb (17) are constituteed, metering drum (8) are circularly, sleeve (13) are installed in the rotation center department of metering drum (8) and are established on axle (15) in the cover, and install ball bearing (16) to sleeve (13) both ends rotation support respectively on axle (15), universal bulb (17) are installed respectively at the both ends of axle (15).
6. The metering drum slewing mechanism according to claim 5, further comprising a metering drum slewing mechanism (3), wherein the shell sealing support assembly (2) comprises a sealing shell (6) and a front bin (5) positioned in the sealing shell (6), two support seats (18) are symmetrically arranged on the inner wall of the front bin (5) respectively, and two ends of the shaft (15) are supported on the two support seats (18) respectively through universal ball heads (17).
7. The metering drum slewing mechanism of claim 5, wherein 3-5 hollow metering chambers (7) are uniformly distributed on the inner circumference of the metering drum (8), a gas collection chamber (9) is arranged at the rear end of the metering chamber (7), and round holes for avoiding the shaft (15) and the output air pipe (10) are formed in the center of the gas collection chamber (9).
8. The rotary mechanism of a metering drum according to claim 5, wherein the sleeve (13) is a tubular hollow structure, two ends of the sleeve are respectively provided with a bearing mounting hole, and the middle part of the sleeve is provided with a plurality of round holes for guiding sealing liquid.
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| CN202110570232.0A CN113252125B (en) | 2021-05-25 | 2021-05-25 | Wet-type gas flowmeter with high measurement accuracy and metering drum rotation mechanism |
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| CN113252125B true CN113252125B (en) | 2023-08-25 |
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